Method for preparing biodiesel by base catalysis in combination with lipase catalysis
A biodiesel and combined preparation technology, applied in fatty acid production, fatty acid chemical modification, biofuel, etc., can solve the problem of no obvious improvement in the actual conversion efficiency of biodiesel, difficulties in separating glycerin and unreacted substrates, and affecting the purity of biodiesel, etc. problem, to achieve the effect of avoiding low transesterification rate, low material requirements for production equipment, and high transesterification rate
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Embodiment 1
[0024] Using olive oil and methanol as the reaction substrate, using CaO-artificial zeolite as the catalyst, and n-hexane as the co-solvent, the molar ratio of olive oil and methanol is 1:3, and the amount of CaO-artificial zeolite is 2% of the total reaction system weight. %, the amount of n-hexane is 10% of the weight of the total reaction system, and after mixing, add it into a ground-mouth Erlenmeyer flask, shake and react at 28°C for 3 hours, and the shaking speed is 120r / min. After the reaction was completed, excessive n-hexane was removed by vacuum distillation at a distillation temperature of 65° C. to obtain an intermediate reaction liquid. The intermediate reaction solution was separated and removed by an ultrahigh-speed centrifuge with a centrifugal force of 637,500×g to remove the CaO-artificial zeolite catalyst. The extracted intermediate reaction product clear liquid was added to the reaction system weight 2% Candida lipase powder, and the transesterification rea...
Embodiment 2
[0026]Rapeseed oil and ethanol were used as the reaction substrate, CaO was used as the catalyst, n-heptane was used as the co-solvent, the molar ratio of rapeseed oil and ethanol was 1:2, the amount of CaO was 1.0% of the total reaction system weight, n-heptane The amount of alkane used is 20% of the weight of the total reaction system. After mixing, it is added to a ground-mouth Erlenmeyer flask, and the reaction is shaken at 20°C for 4 hours, and the shaking speed is 160r / min. After the reaction was completed, excess n-heptane was removed by vacuum distillation at a distillation temperature of 70° C. to obtain an intermediate reaction liquid. The intermediate reaction solution was centrifuged to remove the CaO catalyst with an ultra-high speed centrifuge with a centrifugal force of 765,000×g. The extracted intermediate reaction product clear liquid was added to the reaction system weight 3.0% Bacillus subtilis lipase powder, and the transesterification reaction was continue...
Embodiment 3
[0028] With tea seed oil and butanol as the reaction substrate, MgO as the catalyst, and n-decane as the co-solvent, the molar ratio of tea seed oil and butanol is 1:2, and the amount of MgO is 2.0% by weight of the total reaction system , the amount of n-decane is 15% of the weight of the total reaction system, after mixing, it is added into a ground-mouth Erlenmeyer flask, and the reaction is shaken at 15°C for 4 hours, and the shaking speed is 160r / min. After the reaction was completed, excess n-decane was removed by vacuum distillation at a distillation temperature of 68° C. to obtain an intermediate reaction liquid. The intermediate reaction solution was centrifuged to remove the MgO catalyst with an ultra-high speed centrifuge with a centrifugal force of 765,000×g. Add 3.0% Candida lipase powder by weight of the reaction system to the supernatant liquid of the intermediate reaction product extracted, and continue the transesterification reaction at 30°C with an oscillati...
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